John, people pay extra to have their phone numbers unlisted because they don't want to receive calls promoting the website of your company - or of any other company for that matter.

I only wish that France had the same sort of "do not call" list that they have in the US. If you call someone whose number is on that list, you're subject to a big fine.

You might want to find another way to promote your website, using legitimate (and probably paid-for) advertising.
Cheers,
Bev